Injection Molding
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Unbalanced multi-cavity filling in EVA '2079851475616104452
Problem Phenomenon
In EVA '2079851475616104452 8-cavity mold, filling amount differs ±15% between cavities with some cavities short shot and some flash
Cause Analysis
Unbalanced runner design with inconsistent runner length and resistance for each cavity; inconsistent gate size for each cavity
Solution
1) Adopt balanced runner design to ensure equal length and equal resistance for each cavity; 2) Gate size of each cavity precisely consistent within ±0.01mm; 3) Reduce injection speed to reduce resistance difference influence; 4) Use mold flow analysis software to optimize runner design
Key Takeaway
Unbalanced multi-cavity filling is caused by runner design; balanced runner and mold flow analysis are key
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